CN102269031A - Universal type selective catalytic reduction (SCR) injection system - Google Patents
Universal type selective catalytic reduction (SCR) injection system Download PDFInfo
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- CN102269031A CN102269031A CN2011101822245A CN201110182224A CN102269031A CN 102269031 A CN102269031 A CN 102269031A CN 2011101822245 A CN2011101822245 A CN 2011101822245A CN 201110182224 A CN201110182224 A CN 201110182224A CN 102269031 A CN102269031 A CN 102269031A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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Abstract
The invention relates to a universal type selective catalytic reduction (SCR) injection system, which is used for treating tail gas emitted by an engine. By the system, an appropriate number of reducing agents are injected into the tail gas emitted by the engine to reduce the concentration of NOx. The system mainly comprises a duty cycle control type reducing agent nozzle, an SCR catalytic converter, a pneumatic constant-pressure reducing agent supplying device, an air inlet flow sensor, an exhaust temperature sensor and a control unit, wherein the duty cycle control type reducing agent nozzle is arranged on a main exhaust pipe of the engine; the pneumatic constant-pressure reducing agent supplying device is connected with the duty cycle control type reducing agent nozzle; the air inlet flow sensor and the exhaust temperature sensor are arranged on a main air inlet pipe and the main exhaust pipe of the engine respectively; and the control unit is used for driving and controlling the nozzle and the reducing agent supplying device. Through NOx sensor signals behind the SCR catalytic converter and in front of the duty cycle control type reducing agent nozzle, a general NOx generation amount model, a catalytic converter efficiency model and an ammonia nitrogen ratio control initial manifold absolute pressure (MAP) model, a reducing agent injection system can generate corresponding reducing agent injection amount MAP in a self-learning way; and self-adaptive quantitative injection is realized through the pneumatic constant-pressure reducing agent supplying device. The system can be operated independent of an engine control unit (ECU) and has extremely high generality.
Description
Technical field
The invention belongs to the exhaust aftertreatment technology that motor is discharged, be specifically related to a kind of SCR ejecting system, will an amount of injection of reducing agent be mapped in the tail gas that motor discharges with the NOx concentration in the reduction motor exhaust by this system.
Background technique
Serious day by day along with automobile exhaust pollution, the motor vehicle exhaust emission rules are also more and more stricter.The emission controls by improving combustion of motor has not satisfied strict rules, and the technology path that then adopts emission controls by improving combustion and after-treatment system to combine just can reach more strict statutory standard.
With the heterogeneous body burning is the most difficult control of diesel engine of sign and what have contradiction is two kinds of particulate matter (PM) and nitrogen oxide (NOx).Can effectively handle NOx in the tail gas as the selective catalytic reduction technology (SCR) of one of post-processing technology.Yet because historical reasons, external product is used for reference or introduced to the electronic control system of China's large diesel engine in a large number, to complete machine control algorithm, signaling protocol, hardcore independent development insufficient permission.Simultaneously, the after-treatment system industry development of China also allows of no optimist, and catalytic reactor, system electronic control unit there is no the commodity-type product and occur.SCR and automatical control system intercouple under such prerequisite, the second generation SCR ejecting system of BOSCH company for example, control unit (DCU) needs constantly and Engine ECU is carried out real-time Communication for Power, thereby determine the work information of motor, come to provide the reducing agent quality of required injection under each operating mode by control metered injection pump then, spray thereby control nozzle in real time to nozzle; The SCR after-treatment system of a large amount of independent researches of China at present is as before has followed external pattern, and a machine one mark lacks versatility, can't provide support for the progress of the whole industry.
Summary of the invention
The purpose of this invention is to provide a kind of universal SCR ejecting system, to solve the decoupling problem between engine aftertreatment system and the Engine ECU, thereby the SCR ejecting system is independent of outside the Engine ECU works, and at different SCR catalyst converters, this system can both self study generate corresponding reducing agent injection amount MAP, NOx in the engine exhaust is remained within the reasonable range, improve the versatility of system.
The universal SCR ejecting system of the present invention, comprise dutycycle controlling type reducing agent nozzle that is arranged on the engine exhaust house steward and the SCR catalyst converter that is connected with this nozzle by Venturi tube, pneumatic constant voltage reducer feeding device, intermittent liquid supply device, compressed gas source, reducing agent jar and control unit, the liquid outlet of described reducing agent jar is by the liquid entering hole of II one-way valve and intermittent liquid supply device, the liquid outlet of intermittent liquid supply device is by the liquid entering hole of I one-way valve and pneumatic constant voltage reducer feeding device, the liquid outlet of pneumatic constant voltage reducer feeding device carries out pipeline by the I solenoid valve successively with the inlet of dutycycle controlling type reducing agent nozzle and is connected; Described compressed gas source is connected with pneumatic constant voltage reducer feeding device gas circuit through reduction valve respectively by the II three-way valve, be connected with intermittent liquid supply device gas circuit through III solenoid valve, I three-way valve, the other end of I three-way valve is communicated with described Venturi tube gas circuit by the II solenoid valve; One sampling arm is set respectively before described dutycycle controlling type reducing agent nozzle and on the engine exhaust house steward after the SCR catalyst converter to be bound up on the NOx sensor by automatically controlled three-way valve; The outlet of dutycycle controlling type reducing agent nozzle links to each other with the reducing agent jar by liquid return pipe;
Be respectively arranged with intake flow sensor and exhaust gas temperature sensor on the engine intake manifold He on the exhaust manifold; Bottom at described reducing agent jar, pneumatic constant voltage reducer feeding device is provided with III liquid level sensor, II liquid level sensor respectively; The top of pneumatic constant voltage reducer feeding device also is provided with the I liquid level sensor;
Described control unit constitutes by a single-chip microcomputer with the joining driving circuit board of PWM passage I of single-chip microcomputer; Intake flow sensor and exhaust gas temperature sensor directly and in the control unit A/D ALT-CH alternate channel I of single-chip microcomputer link; III liquid level sensor, II liquid level sensor, I liquid level sensor and NOx sensor respectively with control unit in the A/D ALT-CH alternate channel II of single-chip microcomputer link; Described I solenoid valve, II solenoid valve, III solenoid valve and automatically controlled three-way valve connect with the I/O mouth of single-chip microcomputer in the control unit respectively; Dutycycle controlling type reducing agent nozzle links by the PWM passage I of driving circuit board in the control unit and single-chip microcomputer, and single-chip microcomputer is realized the quantitative injection of reducing agent by control PWM waveform duty cycle.
Principle of the present invention is: when engine running, control unit respectively by gather intake flow sensor, exhaust gas temperature sensor, by behind the SCR catalyst converter and the NOx sensor signal of gathering of the sampling arm before the dutycycle controlling type reducing agent nozzle, after utilizing several typical conditions to construct total NOx growing amount, two kernel models of SCR catalyst converter transformation efficiency, just can construct ammonia nitrogen than controlling initial MAP at the Raw exhaust characteristic of different type of machines and expection NOx emission level.Thereby reductant injection system just can self study generate corresponding reducing agent injection amount MAP.Realize adaptive quantitative injection.
Beneficial effect of the present invention is: universal SCR ejecting system has self-learning capability, only with the former machine emission level of input, expection emissions object, spray feasibility and the reducing agent injection amount MAP that the type emission compliance will be passed judgment on out by system itself for any type through universal SCR after the simple training operating mode.Be that universal SCR jet control system can be independent of Engine ECU work, have very strong versatility.
Description of drawings
Fig. 1 is the structured flowchart of universal SCR ejecting system;
Fig. 2 is the structural representation of intermittent liquid supply device shown in Fig. 1;
Fig. 3 is the structural representation of pneumatic constant voltage reducer feeding device shown in Fig. 1;
Fig. 4 is a control unit composition frame chart shown in Fig. 1.
Embodiment
The embodiment who provides below in conjunction with accompanying drawing is further elaborated ejecting system of the present invention.
With reference to Fig. 1,4, a kind of universal SCR ejecting system comprises the dutycycle controlling type reducing agent nozzle 7 and the SCR catalyst converter 5 that is connected with this nozzle 7 by Venturi tube 6, pneumatic constant voltage reducer feeding device 13, intermittent liquid supply device 18, compressed gas source 12, reducing agent jar 21 and control unit 9 that are arranged on the engine exhaust house steward 8; The liquid outlet of the liquid entering hole of the liquid outlet of described reducing agent jar 21 by II one-way valve 19 and intermittent liquid supply device 18, intermittent liquid supply device 18 successively carries out pipeline by I solenoid valve 15 with the inlet of dutycycle controlling type reducing agent nozzle 7 with the liquid outlet of the liquid entering hole of pneumatic constant voltage reducer feeding device 13, pneumatic constant voltage reducer feeding device 13 by I one-way valve 17 and is connected; Described compressed gas source 12 is connected with pneumatic constant voltage reducer feeding device 13 gas circuits through reduction valve 26 respectively by II three-way valve 25, be connected with intermittent liquid supply device 18 gas circuits through III solenoid valve 24, I three-way valve 23, the other end of I three-way valve 23 is communicated with described Venturi tube 6 gas circuits by II solenoid valve 22; One sampling arm is set respectively before described dutycycle controlling type reducing agent nozzle 7 and on the engine exhaust house steward 8 after the SCR catalyst converter 5 to be bound up on the NOx sensor 10 by automatically controlled three-way valve 11; 7 outlets of dutycycle controlling type reducing agent nozzle link to each other with reducing agent jar 21 by liquid return pipe;
Be respectively arranged with intake flow sensor 2 and exhaust gas temperature sensor 4 on the engine intake manifold 3 He on the exhaust manifold 8; Bottom at described reducing agent jar 21, pneumatic constant voltage reducer feeding device 13 is provided with III liquid level sensor 20, II liquid level sensor 16 respectively; The top of pneumatic constant voltage reducer feeding device 13 also is provided with I liquid level sensor 14;
Described control unit 9 constitutes by a single-chip microcomputer with the joining driving circuit board of PWM passage I of single-chip microcomputer; Intake flow sensor 2 and exhaust gas temperature sensor 4 directly and in the control unit 9 the A/D ALT-CH alternate channel I of single-chip microcomputer link; III liquid level sensor 20, II liquid level sensor 16, I liquid level sensor 14 and NOx sensor 10 respectively with control unit 9 in the A/D ALT-CH alternate channel II of single-chip microcomputer link; Described I solenoid valve 15, II solenoid valve 22, III solenoid valve 24 and automatically controlled three-way valve 11 connect with the I/O mouth of single-chip microcomputer in the control unit 9 respectively; Dutycycle controlling type reducing agent nozzle 7 links by the PWM passage I of driving circuit board in the control unit 9 and single-chip microcomputer, and single-chip microcomputer is realized the quantitative injection of reducing agent by control PWM waveform duty cycle.
With reference to Fig. 2, described intermittent liquid supply device 18, comprise staving 27, be sealedly connected on these staving 27 upper ends top cover 29, be connected in inverted bowl-shape plate body 34 below the top cover 29, a spherical float 31 that can move up and down along this guide pillar be set by cylindricality ring body 28 by being installed in guide pillars 30 in the staving 27; On spherical float 31, be provided with the conical plug 32 that matches with staving liquid entering hole 33; Be equipped with equally distributed conical through-hole on bowl-shape plate body 34 and cylindricality ring body 28, the large aperture end of conical through-hole is respectively towards the outside of bowl-shape plate body 34 and the inboard of cylindricality ring body 28.
With reference to Fig. 3, described pneumatic constant voltage reducer feeding device 13 is made of the cover plate with gas circuit attachment hole 35 of a tank body 36 and this tank body upper end that is tightly connected, and is provided with upper and lower two liquid level sensor jacks, liquid entering hole and liquid outlets on tank body 36.
The working procedure of the universal SCR ejecting system of the present invention:
Selective catalytic reduction process: during motor 1 operation, control unit 9 is determined the operating mode of motor this moment by the signal of gathering air inflow sensor 2 and exhaust temperature sensor 4, NOx sensor signal (the α that control unit 9 can obtain behind the SCR catalyst converter and the sampling arm before the dutycycle controlling type reducing agent nozzle is gathered, β), the reducing agent injection amount MAP that control unit 9 generates according to self study determines the reducing agent injection amount under this operating mode, and by dutycycle controlling type reducing agent nozzle 7 a certain amount of reducing agent is sprayed in the Venturi tube 6.
When motor 1 running, I solenoid valve 15 is opened, and compressed gas source 12 provides the pressurized gas of 6bar to pneumatic constant voltage reducer feeding device 13 by II three-way valve 25, reduction valve 26; And compressed gas source 12 provides 8bar pressurized gas by II three-way valve 25, III solenoid valve 24 and I three-way valve 23 to intermittent liquid supply device 18; Pneumatic constant voltage reducer feeding device remains 6bar pressure, and continues to dutycycle controlling type reducing agent nozzle 6 supply reducing agents through I solenoid valve 15.When the reducing agent liquid level height in the pneumatic constant voltage reducer feeding device 13 is lower than II liquid level sensor 16, III solenoid valve 24 is opened, compressed gas source 12 provides 8bar pressure to intermittent liquid supply device 18, thereby the compression reducing agent is to pneumatic constant voltage reducer feeding device 13; After the liquid level in the pneumatic constant voltage reducer feeding device is higher than I liquid level sensor 14, close III solenoid valve 24, open II solenoid valve 22, gas in the intermittent liquid supply device 18 is discharged to Venturi tube 6 places, because the throttling action at Venturi tube 6 places can make intermittent liquid supply device 18 internal pressures comparatively fast reduce; Reducing agent in the reducing agent jar is because the effect meeting of gravity flows into intermittent liquid supply device 18 through II one-way valve 19.When liquid level arrived certain altitude, the float in the intermittent liquid supply device 18 can cut out liquid entering hole.Close II solenoid valve 22 behind the certain hour.When liquid level height was lower than III liquid level sensor 20 in the reducing agent jar 21, control unit 9 sent the cue of timely adding reducing agent.After motor 1 quit work, control unit sent signal at stop I solenoid valve 15.
After III solenoid valve 24 was opened, the pressurized gas in the compressed gas source 12 entered intermittent liquid supply device 18, and pressurized gas is through the buffer function of cylindricality ring body 28 and inverted bowl-shape plate body 34, and the compression reducing agent enters in the pneumatic constant voltage reducer feeding device 13; When the page in the pneumatic constant voltage reducer feeding device 13 arrives I liquid level sensor 14 positions, electromagnetic valve II I24 closes, electromagnetic valve II 22 is opened, pressurized gas in the intermittent liquid supply device 18 flows in the Venturi tube 6 by the cone shape hole on cylindricality ring body 28 and the inverted bowl-shape plate body 34, because the direction that always increases when gas flows out towards the cone shape hole aperture, pressurized gas is known from experience constantly expansion, thereby the continuous condensation of reducing agent droplet of carrying when pressurized gas is flowed out, finally flow into once more in the intermittent liquid supply device 18, when the liquid level in the intermittent liquid supply device 18 drops to certain altitude, the spherical float 31 that is provided with conical plug reduces to move downward owing to buoyancy, liquid entering hole can be opened, II solenoid valve 22 has been opened at this moment, so the reducing agent in the reducing agent jar 21 can flow in the intermittent liquid supply device 18 by liquid entering hole, when liquid level arrives certain altitude, the spherical float 31 that is provided with conical plug moves upward owing to the buoyancy increase, liquid entering hole can be blocked again, reducing agent can not be flowed into.
Self study process: when motor 1 running, the conversion of the automatically controlled three-way valve 11 of control unit 9 controls, the NOx sensor is connected with the preceding sampling arm of SCR catalyst converter 5 back and dutycycle controlling type reducing agent nozzle 7 respectively, can obtain respectively the preceding NOx sensor signal value of SCR catalyst converter 5 back and dutycycle controlling type reducing agent nozzle 7 (α, β).And charge flow rate and exhaust temperature signal when the intake flow sensor 2 of motor and exhaust gas temperature sensor 4 can detect engine running, and send it to control unit 9.The air inflow of test 13 operating points on complete machine, delivery temperature, NOx sensor signal value (α before SCR catalyst converter 5 backs and the dutycycle controlling type reducing agent nozzle 7, β), charge flow rate signal value x by 13 operating points, NOx concentration value z before exhaust temperature signal value y and the dutycycle controlling type reducing agent nozzle 7 can construct the total growing amount kernel model of NOx f (x, y, z), exhaust temperature signal value y by 13 operating points, NOx concentration value z and the NOx concentration value w behind the catalyst converter 5 before the dutycycle controlling type reducing agent nozzle 7 can construct catalytic converter efficient kernel model g (y, z, w).According to the total growing amount kernel model of the NOx of motor 1 under the 13 operating points f that has made up (x, y, z), catalytic converter efficient kernel model g (y, z, w) and the NOx emission level δ of motor expection just can construct ammonia nitrogen than controlling initial MAP model.Utilize former and later two NOx sensor signals of catalytic converter (α, β) and the total growing amount kernel model of NOx f (x, y, z), catalytic converter efficient kernel model g (y, z, w) and ammonia nitrogen than control initial MAP model, reductant injection system control unit 9 just can self study generate corresponding reducing agent injection amount MAP.
Claims (3)
1. universal SCR ejecting system, comprise dutycycle controlling type reducing agent nozzle 7 that is arranged on the engine exhaust house steward 8 and the SCR catalyst converter 5 that is connected with this nozzle 7 by Venturi tube 6, pneumatic constant voltage reducer feeding device 13, intermittent liquid supply device 18, compressed gas source 12, reducing agent jar 21 and control unit 9 is characterized in that: the liquid outlet of described reducing agent jar 21 is by the liquid entering hole of II one-way valve 19 with intermittent liquid supply device 18, the liquid outlet of intermittent liquid supply device 18 is by the liquid entering hole of I one-way valve 17 with pneumatic constant voltage reducer feeding device 13, the liquid outlet of pneumatic constant voltage reducer feeding device 13 carries out pipeline by I solenoid valve 15 successively with the inlet of dutycycle controlling type reducing agent nozzle 7 and is connected; Described compressed gas source 12 is connected with pneumatic constant voltage reducer feeding device 13 gas circuits through reduction valve 26 respectively by II three-way valve 25, be connected with intermittent liquid supply device 18 gas circuits through III solenoid valve 24, I three-way valve 23, the other end of I three-way valve 23 is communicated with described Venturi tube 6 gas circuits by II solenoid valve 22; One sampling arm is set respectively before described dutycycle controlling type reducing agent nozzle 7 and on the engine exhaust house steward 8 after the SCR catalyst converter 5 to be bound up on the NOx sensor 10 by automatically controlled three-way valve 11; 7 outlets of dutycycle controlling type reducing agent nozzle link to each other with reducing agent jar 21 by liquid return pipe;
Be respectively arranged with intake flow sensor 2 and exhaust gas temperature sensor 4 on the engine intake manifold 3 He on the exhaust manifold 8; Bottom at described reducing agent jar 21, pneumatic constant voltage reducer feeding device 13 is provided with III liquid level sensor 20, II liquid level sensor 16 respectively; The top of pneumatic constant voltage reducer feeding device 13 also is provided with I liquid level sensor 14;
Described control unit 9 constitutes by a single-chip microcomputer with the joining driving circuit board of PWM passage I of single-chip microcomputer; Intake flow sensor 2 and exhaust gas temperature sensor 4 directly and in the control unit 9 the A/D ALT-CH alternate channel I of single-chip microcomputer link; III liquid level sensor 20, II liquid level sensor 16, I liquid level sensor 14 and NOx sensor 10 respectively with control unit 9 in the A/D ALT-CH alternate channel II of single-chip microcomputer link; Described I solenoid valve 15, II solenoid valve 22, III solenoid valve 24 and automatically controlled three-way valve 11 connect with the I/O mouth of single-chip microcomputer in the control unit 9 respectively; Dutycycle controlling type reducing agent nozzle 7 links by the PWM passage I of driving circuit board in the control unit 9 and single-chip microcomputer, and single-chip microcomputer is realized the quantitative injection of reducing agent by control PWM waveform duty cycle.
2. universal SCR ejecting system according to claim 1, it is characterized in that, described intermittent liquid supply device 18, comprise staving 27, be sealedly connected on these staving 27 upper ends top cover 29, be connected in inverted bowl-shape plate body 34 below the top cover 29, a spherical float 31 that can move up and down along this guide pillar be set by cylindricality ring body 28 by being installed in guide pillars 30 in the staving 27; On spherical float 31, be provided with the conical plug 32 that matches with staving liquid entering hole 33; Be equipped with equally distributed conical through-hole on bowl-shape plate body 34 and cylindricality ring body 28, the large aperture end of conical through-hole is respectively towards the outside of bowl-shape plate body 34 and the inboard of cylindricality ring body 28.
3. universal SCR ejecting system according to claim 1, it is characterized in that, described pneumatic constant voltage reducer feeding device 13 is made of the cover plate with gas circuit attachment hole 35 of a tank body 36 and this tank body upper end that is tightly connected, on tank body 36, be provided with upper and lower two liquid level sensor jacks, liquid entering hole and liquid outlets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101822245A CN102269031B (en) | 2011-07-01 | 2011-07-01 | Universal type selective catalytic reduction (SCR) injection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101822245A CN102269031B (en) | 2011-07-01 | 2011-07-01 | Universal type selective catalytic reduction (SCR) injection system |
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| CN102269031A true CN102269031A (en) | 2011-12-07 |
| CN102269031B CN102269031B (en) | 2012-12-05 |
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| CN103016117A (en) * | 2012-12-20 | 2013-04-03 | 潍柴动力股份有限公司 | Method, equipment and system for controlling post processing system of engine |
| CN103048966A (en) * | 2012-12-17 | 2013-04-17 | 浙江达峰汽车技术有限公司 | Remote control system of automobile exhaust purifier testing equipment |
| CN103615300A (en) * | 2013-11-12 | 2014-03-05 | 北京工业大学 | Device and method for performance testing of SCR (selective catalytic reduction) postprocessing system or component of diesel engine |
| CN103850760A (en) * | 2012-12-05 | 2014-06-11 | 现代自动车株式会社 | Urea solution quality determining system |
| CN103912352A (en) * | 2014-04-23 | 2014-07-09 | 吉林大学 | Ammonia flow rate fine control device of solid selective catalytic reduction (SSCR) system |
| CN104100339A (en) * | 2014-07-24 | 2014-10-15 | 吉林省众鑫汽车装备有限公司 | Ammonia electronic-controlled injection device and method |
| CN105386977A (en) * | 2015-12-21 | 2016-03-09 | 上海齐耀螺杆机械有限公司 | Anti-high-temperature-engagement protection device and anti-high-temperature-engagement protection mechanism for liquid-spray oilless screw compressor |
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| CN104100339A (en) * | 2014-07-24 | 2014-10-15 | 吉林省众鑫汽车装备有限公司 | Ammonia electronic-controlled injection device and method |
| CN105386977A (en) * | 2015-12-21 | 2016-03-09 | 上海齐耀螺杆机械有限公司 | Anti-high-temperature-engagement protection device and anti-high-temperature-engagement protection mechanism for liquid-spray oilless screw compressor |
| CN108930573A (en) * | 2017-05-27 | 2018-12-04 | 罗伯特·博世有限公司 | Aqueous solution of urea feed system and the method for controlling the pressure oscillation in the system |
| CN109838295A (en) * | 2017-11-29 | 2019-06-04 | 博世汽车柴油系统有限公司 | The exhaust gas aftertreatment system and pressure fluctuations amplitude of diesel engine determine method |
| CN109838295B (en) * | 2017-11-29 | 2022-12-02 | 博世动力总成有限公司 | Tail gas aftertreatment system of diesel engine and pressure fluctuation amplitude determination method |
| US11525380B2 (en) | 2019-01-11 | 2022-12-13 | Cummins Emission Solutions Inc. | Aftertreatment system with multiple dosing modules |
| CN113924408A (en) * | 2019-05-09 | 2022-01-11 | 康明斯排放处理公司 | Valve device for split-flow type close connection catalyst |
| CN113924408B (en) * | 2019-05-09 | 2023-11-14 | 康明斯排放处理公司 | Valve device for split-flow close-coupled catalyst |
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| CN102269031B (en) | 2012-12-05 |
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